<script lang="ts" setup name="GoodsImage">
import { computed, ref } from 'vue';
import { useMouseInElement } from '@vueuse/core'

// 接收父向子传的图片数据
defineProps<{
    images:string[]
}>()

// 初始值
const current = ref(0)

// 放大镜
const target = ref(null)
const {elementX,elementY,isOutside} = useMouseInElement(target)

// 计算遮罩层的定位坐标
const position = computed(()=>{
    let x = elementX.value - 100
    let y = elementY.value - 100
    
    if(x<0) x = 0
    if(x>200) x = 200
    if(y<0) y = 0
    if(y>200) y = 200
    
    return {
        x,
        y
    }
})
</script>
<template>
  <div class="goods-image">
    <!-- 大图区域 -->
    <div 
    class="large"
    v-show="!isOutside" 
    :style="[{backgroundImage:`url(${images[current]})`,backgroundPosition:`${-position.x*2}px ${-position.y*2}px`}]">
    </div>
    <!-- 中图区域 -->
    <div class="middle" ref="target">
      <img :src="images[current]" alt=""/>
      <div 
      class="layer" 
      v-show="!isOutside"
      :style="{left:`${position.x}px`,top:`${position.y}px`}"
      ></div>
    </div>
    <!-- 小图区域 -->
    <ul class="small">
      <li 
        v-for="(item,index) in images" 
        :key="index" 
        :class="{active:index===current}"
        @mouseenter="current=index"
      >
        <img :src="item" alt=""/>
      </li>
    </ul>
  </div>
</template>

<style scoped lang="less">
.goods-image {
  width: 480px;
  height: 400px;
  position: relative;
  display: flex;
  z-index: 500;
  .large {
    position: absolute;
    top: 0;
    left: 412px;
    width: 400px;
    height: 400px;
    box-shadow: 0 0 10px rgba(0,0,0,0.1);
    background-repeat: no-repeat;
    background-size: 800px 800px;
    background-color: #f8f8f8;
  }
  .middle {
    width: 400px;
    height: 400px;
    background: #f5f5f5;
    position: relative;
    cursor: move;
    .layer {
      width: 200px;
      height: 200px;
      background: rgba(0,0,0,.2);
      left: 0;
      top: 0;
      position: absolute;
    }
  }
  .small {
    width: 80px;
    li {
      width: 68px;
      height: 68px;
      margin-left: 12px;
      margin-bottom: 15px;
      cursor: pointer;
      &:hover,
      &.active {
        border: 2px solid @xtxColor;
      }
    }
  }
}
</style>
